How do stomata work in photosynthesis?

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STOMATA EXIST ON THE UNDERSIDE OF LEAVES IN ORDER FOR GASES TO ENTER THE LEAVE AND DELIVER OXYGEN AND PICK UP WASTE PRODUCTS OF PHOTOSYNTHSIS. THIS OCURS IN THE PALISIDE LAYER OF THE LEAF. THE SPONGY MESOPHYLL OF THE LEAF HAS A LARGE SURFACE AREA ENSURING EFFECENT GAS EXCHANGE. HOWEVER THE OPENING OF THE STOMATA LEADS TO WATER LOSS.SO THE GUARD CELLS CLOSE THE STOMATA. THIS IS TO DO WITH ENVIRNMENTAL CONDITIONS AY THE TIME EG HUMIDITY. THE WATER POTENTIAL OF THE GUARD CELLS MEANS WATER IS DRAWN OUT OF A PLANT AND THE STOAMTA CLOSES SHUT. THE STOMATA IS USUALLY CLOSED AT NIGHT AND OPEN IN DAY AS PLANTS ONLY PHOTOSYNTHESISE AT DAY AND NOT AT NIGHT SO DONT NEED OXYGEN.